Marcelo Filho
added a comment - 2018-01-30 18:36 I would like to propose to reopen this ticket once I would like to propose the steps to reproduce:
Have a Jenkins 1.x version installed
Misconfigure two JDKs in the Configure System
Update to 2.x version
Workaround: Remove the extra JDK before update the Jenkins.

Marcelo Filho
added a comment - 2018-01-30 18:42 Sorry for the comment flood but I will update this as soon as I´m facing the problems...
After update ALL plugins the problem showed up again, I will try to figure out this now.

Rashed Amiri
added a comment - 2018-04-03 04:24 Marcelo Filho , Do you have any updates on this issue? Struggling a lot to find a fix for this, but it seems like there's something wrong with the new Jenkin's UI or could it be a plugin issue?

Rashed Amiri actually there is no standard way to workaround this once looks very random. The source of the problem is that somehow the XML of the credentials is changed and the XML format is broken but even after many plugins installation and uninstallation the source plugin or cause was not found. My advise is to save a backup copy of you configuration XML and apply it again when this problem appear. I will dive into it soon and let you know if I get any new result.

Marcelo Filho
added a comment - 2018-04-03 18:30 Rashed Amiri actually there is no standard way to workaround this once looks very random. The source of the problem is that somehow the XML of the credentials is changed and the XML format is broken but even after many plugins installation and uninstallation the source plugin or cause was not found. My advise is to save a backup copy of you configuration XML and apply it again when this problem appear. I will dive into it soon and let you know if I get any new result.